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[PATCH] mm: page_state opt

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Optimise page_state manipulations by introducing interrupt unsafe accessors
to page_state fields.  Callers must provide their own locking (either
disable interrupts or not update from interrupt context).

Switch over the hot callsites that can easily be moved under interrupts off
sections.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-01-06 00:11:20 -08:00
committed by Linus Torvalds
parent d3cb487149
commit a74609fafa
4 changed files with 104 additions and 65 deletions
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27
mm/vmscan.c
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@@ -645,16 +645,17 @@ static void shrink_cache(struct zone *zone, struct scan_control *sc)
goto done;
max_scan -= nr_scan;
if (current_is_kswapd())
mod_page_state_zone(zone, pgscan_kswapd, nr_scan);
else
mod_page_state_zone(zone, pgscan_direct, nr_scan);
nr_freed = shrink_list(&page_list, sc);
if (current_is_kswapd())
mod_page_state(kswapd_steal, nr_freed);
mod_page_state_zone(zone, pgsteal, nr_freed);
spin_lock_irq(&zone->lru_lock);
local_irq_disable();
if (current_is_kswapd()) {
__mod_page_state_zone(zone, pgscan_kswapd, nr_scan);
__mod_page_state(kswapd_steal, nr_freed);
} else
__mod_page_state_zone(zone, pgscan_direct, nr_scan);
__mod_page_state_zone(zone, pgsteal, nr_freed);
spin_lock(&zone->lru_lock);
/*
* Put back any unfreeable pages.
*/
@@ -816,11 +817,13 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
}
}
zone->nr_active += pgmoved;
spin_unlock_irq(&zone->lru_lock);
pagevec_release(&pvec);
spin_unlock(&zone->lru_lock);
mod_page_state_zone(zone, pgrefill, pgscanned);
mod_page_state(pgdeactivate, pgdeactivate);
__mod_page_state_zone(zone, pgrefill, pgscanned);
__mod_page_state(pgdeactivate, pgdeactivate);
local_irq_enable();
pagevec_release(&pvec);
}
/*